Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a first image of a display screen or portionthereof with an animated graphical user interface; and,

FIG. 2 is a front view of a second image thereof.

The appearance of the image transitions sequentially between the imagesshown in FIGS. 1 and 2. The outermost broken lines illustrate a displayscreen or portion thereof and form no part of the claimed design. Theremaining broken lines, illustrating portions of the animated graphicaluser interface, form no part of the claimed design. The process orperiod in which one image transitions to another forms no part of theclaimed design.

CLAIM The ornamental design for a display screen or portion thereof withan animated graphical user interface, as shown and described.